When I was a kid I remember reading a book about two frogs. They lived in a 
forest/swamp type place and had a variety of animal friends. I believe one was 
always grumpy and the other always happy. There were a bunch of these books, 
kinda like theres a bunch of clifford books, but for the life of me I cant 
remember what the series was called! What are the names of these books and 
frogs?

From your description, I believe that the book series you are looking for 
is "Frog and Toad" by Arnold Lobel. The main characters of the books are Frog, 
who is friendly, and Toad who is Grumpy. There are four books in the collection:

Frog and Toad Are Friends
Frog and Toad Together
Days with Frog and Toad
Frog and Toad All Year


For more information on the author, Arnold Lobel, visit:

http://www.eduplace.com/kids/hmr/mtai/lobel.html
For an interview with the author

http://www.edupaperback.org/authorbios/Lobel_Arnold.html
For a biography of the author


These books are available for purchase through Barnes & Noble or Amazon.com.